78091714521 has 10 divisors (see below), whose sum is σ = 116655524282. Its totient is φ = 52061142960.

The previous prime is 78091714517. The next prime is 78091714531. The reversal of 78091714521 is 12541719087.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 52918401600 + 25173312921 = 230040^2 + 158661^2 .

It is not a de Polignac number, because 78091714521 - 2² = 78091714517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78091714531) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 482047540 + ... + 482047701.

Almost surely, 2^78091714521 is an apocalyptic number.

It is an amenable number.

78091714521 is a deficient number, since it is larger than the sum of its proper divisors (38563809761).

78091714521 is an equidigital number, since it uses as much as digits as its factorization.

78091714521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964095253 (or 964095244 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 78091714521 in words is "seventy-eight billion, ninety-one million, seven hundred fourteen thousand, five hundred twenty-one".